PluginManager.h

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#ifndef WIRECELL_PLUGINMANAGER
#define WIRECELL_PLUGINMANAGER

#include "WireCellUtil/Logging.h"

#include <map>
#include <string>

namespace WireCell {

    class Plugin {
    public:
        Plugin(void* lib);
        ~Plugin();

        void* raw(const std::string& symbol_name);
        
        bool contains(const std::string& symbol_name);

        template<typename T>
        bool symbol(const std::string& symbol_name, T& ret) {
            void* thing = raw(symbol_name);
            if (!thing) { return false; } 
            ret = reinterpret_cast<T>(thing);
            return true;
        }
    private:
        void* m_lib;
    };

    /** This is meant to be used from a WireCell::Singleton. */
    class PluginManager{
        Log::logptr_t l;
        PluginManager();
        ~PluginManager();
    public:
        static PluginManager& instance();

        /// Add a plugin.  If libname is not given, try to derive it.
        Plugin* add(const std::string& plugin_name, const std::string& libname = "");

        Plugin* get(const std::string& plugin_name);

        Plugin* find(const std::string& symbol_name);
    private:
        std::map<std::string, Plugin*> m_plugins;
    };

}

#endif